Extended Data Fig. 6: Further a.c. susceptibility measurements.
From: RETRACTED ARTICLE: Evidence of near-ambient superconductivity in a N-doped lutetium hydride
a, The a.c. susceptibility in nanovolts versus temperature for a larger sample of the N-doped Lu hydride system at select pressures from run 2, showing large diamagnetic signal of the superconducting transition owing to the large volume of the sample. The superconducting transition shifts rapidly under pressure to lower temperatures. a.c. susceptibility measurements taken over broader temperature ranges for N-doped Lu hydride at 4 kbar (b), 6 kbar (c) and 8 kbar (d). The red line in b–d is the quadratic fit for the background and the insets show the signals with the background subtracted. e, a.c. susceptibility measurements of MgB2 as a function of temperature using exact same coil set up as the test sample.
